Elements used inside the front matter of a book (element <book-front>) to describe introductory material such as author biographical information
As described here, “front matter” is not the metadata for a book or book component, but rather the material which may introduce a book such as prefaces, glossaries, author biographies, etc.
<!ENTITY % doc-front-matter-mix
"%front.class; | %front-back.class; |
%just-table.class; | %sec.class;" >bookcustom-mixes.ent